The following packages have unmet dependencies:
gparted :
Depends: libglibmm-2.4-1c2a (>= 2.42.0) but 2.39.93-0ubuntu1 is to be installed
Depends: libparted-fs-resize0 (>= 3.1) but it is not installable
Depends: libparted2 (>= 3.1) but it is not installable
Depends: libstdc++6 (>= 4.9) but 4.8.2-19ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.

I tried some solutions like

apt clean

or removing many repositories out of /etc/apt/sources.list and /etc/apt/sources.d but the error still remained.

After some tries i found the solution via these commands:

The installation of libparted-fs-resize0 does not work with the following error: